/*
 * Copyright (c) 2003-2008 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors 
 *   may be used to endorse or promote products derived from this software 
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jmex.swt.lwjgl;

import java.util.HashMap;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.opengl.GLData;
import org.eclipse.swt.widgets.Composite;
import org.lwjgl.LWJGLException;

import com.jme.system.DisplaySystem;
import com.jme.system.JmeException;
import com.jme.system.canvas.CanvasConstructor;
import com.jme.system.canvas.JMECanvas;
import com.jmex.swt.lwjgl.LWJGLSWTConstants.Threadmode;

public class LWJGLSWTCanvasConstructor implements CanvasConstructor {

	public JMECanvas makeCanvas(HashMap<String, Object> props) {
		try {
			Composite parent = (Composite) props.get(LWJGLSWTConstants.PARENT);

			GLData data = new GLData();
			data.doubleBuffer = true;
			Integer depthBits = (Integer) props.get(LWJGLSWTConstants.DEPTH_BITS);
			if (depthBits != null) {
				data.depthSize = depthBits;
			} else {
				data.depthSize = DisplaySystem.getDisplaySystem().getMinDepthBits();
			}

			Integer alphaBits = (Integer) props.get(LWJGLSWTConstants.ALPHA_BITS);
			if (alphaBits != null) {
				data.alphaSize = alphaBits;
			} else {
				data.alphaSize = DisplaySystem.getDisplaySystem().getMinAlphaBits();
			}

			Integer stencilBits = (Integer) props
					.get(LWJGLSWTConstants.STENCIL_BITS);
			if (alphaBits != null) {
				data.stencilSize = stencilBits;
			} else {
				data.stencilSize = DisplaySystem.getDisplaySystem()
						.getMinStencilBits();
			}

			// NOTE: SWT does not actually implement samples yet.
			Integer samples = (Integer) props.get(LWJGLSWTConstants.SAMPLES);
			if (samples != null) {
				data.samples = samples;
			} else {
				data.samples = DisplaySystem.getDisplaySystem().getMinStencilBits();
			}

			Integer style = (Integer) props.get(LWJGLSWTConstants.STYLE);
			if (style == null) {
				style = SWT.NONE;
			}

			if (props.get(LWJGLSWTConstants.THREADMODE) != null) {
				Threadmode threadmode = (Threadmode) props
						.get(LWJGLSWTConstants.THREADMODE);
				final LWJGLSWTCanvas canvas = new LWJGLSWTCanvas(parent, style,
						data, threadmode);

				canvas.addPaintListener(new PaintListener() {
					public void paintControl(PaintEvent e) {
						canvas.makeDirty();
					}
				});
				return canvas;
			}
			final LWJGLSWTCanvas canvas = new LWJGLSWTCanvas(parent, style,
					data);

			canvas.addPaintListener(new PaintListener() {
				public void paintControl(PaintEvent e) {
					canvas.makeDirty();
				}
			});

			return canvas;

		} catch (LWJGLException e) {
			e.printStackTrace();
			throw new JmeException("Unable to create lwjgl-swt canvas: "
					+ e.getLocalizedMessage());
		}
	}
}
